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Background Low levels of autophagy plays a protective role in cardiomyoctyes, whereas high levels or chronic autophagy can facilitate cell injury and result in the death of cells that cannot be repaired.How to effectively inhibit autophagy and attenuate myocardial damage has become a cardiovascular disease research hotspot.Apelin is highly expressed in the cardiovascular system where it exerts protective effects.The objective of this study is to investigate the effect of apelin-13 on cardiomyocyte autophagy and to determine the underlying mechanism of this effect.